This image taken from security camera video shows a train derailing in Santiago de Compostela, Spain, on Wednesday, July 24, 2013. Spanish investigators tried to determine Thursday why a passenger train jumped the tracks and sent eight cars crashing into each other just before arriving in this northwestern shrine city on the eve of a major Christian religious festival, killing at least 77 people and injuring more than 140. (AP Photo)

A firefighter uses and axe to open their way inside a train car at the site of a train accident in Santiago de Compostela, Spain, on Thursday, July 25, 2013. An Associated Press analysis of video images shows that a Spanish train was traveling well above the speed limit when it derailed, killing at least 80 people. Officials say the speed limit on that section of track is 80 kph (50 mph). (AP Photo/Lalo Villar)

SANTIAGO DE COMPOSTELA, Spain (AP) — Spanish police said Friday they have arrested the driver of the train that sped through a curve and toppled over, killing 78 people, and plan to question him over suspected reckless driving.

As blame increasingly fell on the still-hospitalized driver over Spain's deadliest railway crash in decades, authorities located the train's so-called "black box" that is expected to shed further light on the disaster's cause.

Investigators said they would seek evidence of failings by Francisco Jose Garzon Amo, the 52-year-old driver, as well as the train's internal speed-regulation systems in the Wednesday derailment.

The chief of the train operator, Renfe, defended the driver Friday, lauding what it called his exhaustive experience. But the country's railway agency, Adif, noted that the driver should have started slowing the train long before reaching the disastrous turn.

In an interview with The Associated Press, an American passenger injured on the train said he saw on a TV monitor screen inside his car that the train was traveling 194 kph (121 mph) seconds before the crash — far above the 80 kph (50 mph) speed limit on the curve where it derailed. The passenger, 18-year-old Stephen Ward, said the train appeared to have accelerated, not decelerated.

And Gonzalo Ferre, president of the rail infrastructure company Adif, said the driver should have started slowing the train 4 kilometers (2.5 miles) before reaching a dangerous bend that train drivers had been told to respect.

"Four kilometers before the accident happened he already had warnings that he had to begin slowing his speed, because as soon as he exits the tunnel he needs to be traveling at 80 kilometers per hour," Ferre said.

At the scene, hundreds of onlookers watched as crews used a crane Friday to hoist smashed and burned-up cars onto flat-bed trucks to cart them away. The shattered front engine had been tipped back upright but remained resting beside the tracks, just yards (meters) from the passage of resumed train traffic.

Grieving families gathered for funerals near the site of the crash in Santiago de Compostela, a site of Catholic pilgrimage that had been preparing to celebrate its most revered saint, James, but those annual festivities were canceled Thursday.

Police lowered the death toll Friday to 78 as forensic scientists matched body parts. They previously had identified 80 dead.

Amo was officially arrested Thursday night in the hospital. Photographs indicated he suffered a head wound in the crash.

Jaime Iglesias, police chief of Spain's northwest Galicia region, said Amo would be questioned "as a suspect for a crime linked to the cause of the accident." When asked, Iglesias described Amo's alleged offense as "recklessness." He declined to elaborate.

The driver is being guarded by police and has yet to be interviewed. That might be delayed because of his medical treatment, Iglesias said.

Renfe said Amo is a 30-year employee of the state train company, who became an assistant driver in 2000 and a fully qualified driver in 2003.

Amo had driven trains past the spot of the accident 60 times and "the knowledge of this line that he had to have is exhaustive," Renfe's president, Julio Gomez-Pomar, said in a TV interview.

Police are still working to identify what they believe are the remains of six people. Antonio del Amo, the chief scientific officer of Spain's National Police, cautioned that the death toll could be revised as they continue their work matching body parts.

Iglesias said police took possession of the train's "black box," which is expected to shed light on why it was going faster than the speed limit. The box will be handed over to the investigating judge, Iglesias said, adding that the box had not been opened yet.

The box records the train's trip data, including speed, distances and braking, and is similar to a flight recorder for an airplane. A court spokeswoman declined to comment on how long analysis of the box's contents would take.

One American died in the cash. She was identified by the Diocese of Arlington as Ana Maria Cordoba, an administrative employee from northern Virginia.

Also among the dead were an Algerian and a Mexican, Spanish police said Friday.

Eyewitness accounts backed by security-camera footage of the moment of disaster showed that the eight-carriage train was going too fast as it tried to turn left underneath a road bridge. After impact, witnesses said a fire engulfed passengers trapped in at least one carriage, most likely driven by ruptured tanks of diesel fuel carried in the forward engines.

Ward, an 18-year-old Mormon missionary from Utah who was on the train, said he was writing in his journal when he looked up at the monitor and saw the train's speed. Then, he said, "the train lifted up off the track. It was like a roller coaster."

Seconds later, Ward remembered, a backpack fell from the rack above him and he felt the train fly off the track. That was his last memory before he blacked out on impact.

When Ward woke up, someone was helping him walk out of his train car and crawl out of a ditch where the car had toppled over. He thought he was dreaming for 30 seconds until he felt his blood-drenched face and noticed the scene around him.

"Everyone was covered in blood. There was smoke coming up off the train," he said. "There was a lot of crying, a lot of screaming. There were plenty of dead bodies. It was quite gruesome."

It was Spain's deadliest train accident since 1972, when a train collided with a bus in southwest Spain, killing 86 people and injuring 112.

*We welcome your comments on the stories and issues of the day and seek to provide a forum for the community to voice opinions. All comments are subject to moderator approval before being made visible on the website but are not edited. The use of profanity, obscene and vulgar language, hate speech, and racial slurs is strictly prohibited. Advertisements, promotions, spam, and links to outside websites will also be rejected. Please read our terms of service for full guides